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Long-term effects of constant light or darkness on chicken pineal hydroxyindole-O-methyltransferase expression: biochemical and cellular aspects (1992)

Guerlotté, J. ; Voisin, P. ; Bernard, M. ; [et al.]

Springer

Cellular and molecular neurobiology 12 (1992), S. 177-184

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ISSN: 1573-6830

Keywords: chicken ; pineal ; melatoninergic cells ; hydroxyindole-O-methyltransferase ; constant light ; constant darkness

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary 1. Chickens kept in constant light, as opposed to constant darkness, display a twofold increase in the activity of pineal hydroxyindole-O-methyltransferase (HIOMT), the last acting enzyme in the melatonin pathway. 2. Using an immunological approach, we presently show that this regulation of HIOMT activity reflects changes in the concentration of a single molecular form of the enzyme protein (a 38 kDa polypeptide). Immunohistofluorescence indicates that these concentration changes concurrently affect modified photoreceptors and pinealocyte-like cells in the chicken pineal organ. 3. Together, the present data support the hypothesis that environmental lighting might regulate the expression of the HIOMT gene.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00713371

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Redox processes in polyaniline thin film studied by optical multichannel analysis (1992)

Bernard, M. C. ; Hugot-Le Goff, A.

Chichester [u.a.] : Wiley-Blackwell

Surface and Interface Analysis 19 (1992), S. 27-32

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ISSN: 0142-2421

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Physics

Notes: Optical multichannel analysis (OMA) was used to follow the kinetics of colour changes in electrochromic polyaniline films when the latter are polarized in an electrolytic medium at different potentials. These colour changes, which are related to the transition from one polymer form to another, are very fast. OMA also allowed us to obtain an apparent value of the film absorption coefficient. In the investigated range (300-800 nm), several absorption phenomena can be displayed which are characteristic of the different polymer forms. Two electrolytic media (1 M HCl and 1 M H2SO4) were compared to investigate the role played by the size of the inserted counter-ion. The overall results allow us to estimate the practical possibility of using polyaniline in electrochromic devices.

Additional Material: 9 Ill.